Portable power supply



FIG. 1 is a front perspective view, from above, of a portable power supply of the present invention.

FIG. 2 is another front perspective view, from above, thereof;

FIG. 3 is a rear perspective view, from above, thereof;

FIG. 4 is another rear perspective view, from above, thereof;

FIG. 5 is a rear perspective view, from below, thereof;

FIG. 6 is a front perspective view, from below, thereof;

FIG. 7 is another front perspective view, from below, thereof;

FIG. 8 is another rear perspective view, from below, thereof;

FIG. 9 is a front elevation view thereof;

FIG. 10 is a side elevation view thereof;

FIG. 11 is a rear elevation view thereof;

FIG. 12 is another side elevation view thereof;

FIG. 13 is a bottom plan view thereof; and,

FIG. 14 is a top plan view thereof.

The broken lines shown represent portions of the portable power supply that form no part of the claimed design. 

CLAIM The ornamental design for a portable power supply, as shown and described. 